Ok, sorry I didn't see this sooner, but I just left India.
Ok so as you have been told yes you can upgrade and yes it is fairly easy.
the question I have is are you running and electronic ballast or a normal ballast, if it is electronic then you will get a small increase in output but you will get the other benifits of a larger more even foot print.
If it is a normal M80 ballast you will get all the benifits of the other plus a huge increase in light out put.
as for bulb use, any one is usble as they are all based off German bulbs, even the USHIO which has a probe starter in it still works on an pulse start ballast.
XM bulbs respong suprisingly well to HQI power supplies so they are a good choice in bulbs.
it is definatly not worth it to go to a 400 set up, you already have the ballast, so for the most part you would not gain any output from a 400 over the HQI as there is realy no good ballast for a 400 set up that is made for high output like a HQI. the 400 HQI's are not a HQI ballast and actualy decrease bulb life instead of increasing it as a good HQI setup will.
Steve
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